TW201514604A - Illumination device and projector - Google Patents

Illumination device and projector Download PDF

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Publication number
TW201514604A
TW201514604A TW103126476A TW103126476A TW201514604A TW 201514604 A TW201514604 A TW 201514604A TW 103126476 A TW103126476 A TW 103126476A TW 103126476 A TW103126476 A TW 103126476A TW 201514604 A TW201514604 A TW 201514604A
Authority
TW
Taiwan
Prior art keywords
light
light source
optical system
incident
portion
Prior art date
Application number
TW103126476A
Other languages
Chinese (zh)
Other versions
TWI533077B (en
Inventor
Nozomu Inoue
Akira Miyamae
Shigehiro Yanase
Hiroyuki Shindo
Original Assignee
Seiko Epson Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2013162610A priority Critical patent/JP6268798B2/en
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Publication of TW201514604A publication Critical patent/TW201514604A/en
Application granted granted Critical
Publication of TWI533077B publication Critical patent/TWI533077B/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B26/00Optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light, e.g. switching, gating, modulating
    • G02B26/007Optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light, e.g. switching, gating, modulating the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008Optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light, e.g. switching, gating, modulating the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/005Projectors using an electronic spatial light modulator but not peculiar thereto
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2006Lamp housings characterised by the light source
    • G03B21/2013Plural light sources
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2006Lamp housings characterised by the light source
    • G03B21/2033LED or laser light sources
    • G03B21/204LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/206Control of light source other than position or intensity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141Constructional details thereof
    • H04N9/315Modulator illumination systems
    • H04N9/3158Modulator illumination systems for controlling the spectrum

Abstract

The present invention provides an illumination device and a projector that can detect a defect occurring in a wheel with a simple configuration. The present invention relates to a lighting device including: a light source device; and a rotary diffusing plate including a first surface, a second surface, a diffusing portion provided on the first surface, and a first surface and the second surface a detecting portion of at least one of the light from the light source device; a collecting optical system for incident light from the diffusing portion; a detector for detecting light from the detecting portion; and a control device for self-detecting The signal output from the device controls the light source device. The detecting unit is provided at a position different from a position at which light from the light source device is incident on the diffusing portion.

Description

Lighting device and projector

The present invention relates to a lighting device and a projector.

As one of the light source devices for the projector, there has been proposed a light source device that emits laser light as excitation light to the phosphor layer to generate a fluorescent light having a wavelength different from that of the excitation light (see, for example, Patent Document 1 below).

In the light source device described above, a reflection member is provided in advance in a light transmitting member attached to a portion of the rotating wheel, and rotation is detected based on a periodic change in reflected light caused by the rotation. Thereby, the occurrence of a problem such as falling off in the rotating wheel is detected.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2011-113071

However, in the above prior art, it is necessary to provide a complicated mechanism at the mounting portion of the transmitting member, which is costly, and at the same time, since the detecting mechanism is also prone to malfunction, there is a possibility of false detection. Further, since the detecting portion is provided in a region overlapping the transmitting member, for example, when applied to the transmissive diffusing wheel, the detecting portion must be such that the detecting method does not interfere with the effective use of the light for display. Restricted and other issues.

One aspect of the present invention has been made in order to solve the above problems, and an object thereof is to provide a lighting device which can detect a defect occurring in a wheel by a simple configuration. Set up the projector.

According to a first aspect of the present invention, a lighting device includes: a light source device; and a rotary diffusing plate including a first surface, a second surface, a diffusing portion provided on the first surface, and a a detecting portion of at least one of the first surface and the second surface, wherein light from the light source device is incident; a collecting optical system for incident light from the diffusing portion; and a detector for detecting from the detecting And a control device that controls the light source device based on a signal output from the detector; and the detection portion is disposed at a position different from a position at which light from the light source device is incident on the diffusion portion.

According to the illuminating device of the first aspect, since the detecting portion is provided at a position different from the position at which the light from the light source device is incident on the diffusing portion, it is possible to prevent the light emitted from the diffusing portion from being hindered by the detecting portion. Further, since it is a simple configuration such as adjusting the position of the detecting unit, it is possible to reduce the cost. Therefore, it is possible to provide a structure in which the rotating diffusion plate is of a transmissive type or a reflective type, regardless of the detection method, and it is possible to detect the problem caused by the rotary diffusion plate by detecting the light from the detecting portion well. A versatile lighting fixture.

Further, the detecting unit may have a function of shielding incident light. With this configuration, the failure state of the detecting unit can also be determined.

Moreover, it is preferable that the detection unit is provided on the second surface.

In this case, since the detecting portion is provided on a surface different from the surface on which the diffusing portion is provided, it is possible to prevent the light of the diffusing portion from being blocked due to the laminated diffusing portion and the detecting portion.

In the first aspect, the detecting unit may be configured to diffuse at least a part of the incident light. According to this configuration, the detecting portion can be configured using one of the diffusing portions.

Moreover, it is preferable that the detection unit is provided on the first surface.

In this case, the detection step and the diffusion portion can be formed by the same steps.

Further, it is preferable that the detector is provided at a position away from an extension of the chief ray of the light incident on the detecting portion.

In this case, the detecting portion may be configured using one of the diffusing portions. Further, since the detector is disposed at a position away from the extension of the chief ray of the light incident on the detecting portion, it is possible to satisfactorily detect the light which is radially diffused by the diffusion of the detecting portion. Further, since the detector is disposed at a position away from the rotary diffusion plate, it is prevented that the detector is in contact with the rotary diffusion plate.

In the first aspect, the light source device includes a first light source and a second light source, and light from the first light source is incident on the diffusion portion, and light from the second light source is incident on the light source. Detection department.

According to this configuration, the function can be dispersed to the first light source and the second light source. Further, the wavelength of the light incident on the diffusing portion and the wavelength incident on the detecting portion can be appropriately set independently.

Further, it is preferable that the first light source and the second light source emit light of different wavelength bands.

According to this configuration, erroneous detection of the detector can be prevented.

Further, it is preferable that the first light source and the second light source emit light of different wavelength bands.

According to this configuration, the function can be dispersed to the first light source and the second light source. Thereby, the light of the first light source can be favorably emitted to the outside as illumination light.

In the first aspect, the detecting unit may be configured to reflect at least a part of the incident light.

According to this configuration, the rotation state of the rotary diffusion plate can be detected using the reflected light.

In the first aspect, the detecting unit may be configured to include a plurality of detection patterns intermittently provided along a rotation direction of the rotary diffusion plate.

According to this configuration, since the detecting portion includes a plurality of intermittent detection patterns along the rotation direction of the rotary diffusion plate, the cycle can be detected with the rotation of the rotary diffusion plate. The signal of sex. Moreover, it is also possible to easily detect a situation in which the detector or the detection light is defective.

In the first aspect described above, the diffusing portion may be configured as a phosphor layer.

According to this configuration, the fluorescent light can be extracted from the diffusing portion.

According to a second aspect of the present invention, a projector includes: an illumination device that illuminates illumination light; and a light modulation device that forms an image by modulating the illumination light according to image information. And a projection optical system that projects the image light; and the illumination device of the first aspect is used as the illumination device.

According to the configuration of the projector of the second aspect, since the illumination device is provided, the projector itself is also cost-effective, and the reliability of the failure of the wheel can be satisfactorily detected.

1, 101‧‧‧ projector

2‧‧‧1st lighting device

3‧‧‧Separation optical system

4‧‧‧2nd lighting device (lighting device)

5B, 5G, 5R, 105B, 105G, 105R‧‧‧ optical modulation devices

6‧‧‧Synthetic optical system

7‧‧‧Projection optical system

8, 23, 210, 220‧ ‧ dichroic mirror

9a‧‧‧1st polarized separation mirror

9b‧‧‧2nd polarized separation mirror

9c‧‧‧3rd polarizing mirror

10B, 10G, 10R‧‧ field lens

21‧‧‧Array light source

21a, 41a‧‧‧ semiconductor laser

22, 42‧‧‧ collimating optical system

22a, 42a‧‧ ‧ collimating lens

24, 43A‧‧‧ Concentrating optical system

25, 344‧‧‧ fluorescent light-emitting elements

26, 45‧‧·Integral optical system

26a, 26b, 45a, 45b‧‧‧ lens array

27, 46‧‧‧ polarized light conversion components

28‧‧‧Overlap optical system

28a, 47a‧‧‧ overlapping lenses

29‧‧‧Fluorescent layer

30‧‧‧Reflective film

32, 50‧‧‧ drive motor

31, 48‧‧‧ rotating plate (rotary diffuser)

32a‧‧‧Rotary axis

35‧‧‧Mirror components

41‧‧‧Array light source (light source device, first light source)

43c‧‧‧ Concentrating lens

44, 144, 244‧‧‧Light diffusing elements

47‧‧‧Overlapping optical system (concentrating optical system)

48a‧‧‧ gap

49‧‧‧Light diffusion layer (diffusion)

50a‧‧‧Rotary axis

51, 251, 351 ‧ ‧ inspection pattern (detection department)

51a‧‧‧ shading pattern

52, 152, 252, 352‧ ‧ detector

52a‧‧‧Framework

52b, 152b, 252b, 352b‧‧‧Light-emitting elements (second light source)

52c, 152c, 252c, 352c‧‧‧ light-receiving components

53‧‧‧ filter

55‧‧‧Fluorescent layer (diffusion)

103‧‧‧Lighting optical system

104‧‧‧Lighting device

110‧‧‧Liquid components

111‧‧‧Concentrating lens (concentrating optical system)

112‧‧‧ rod integrator

113‧‧‧Parallel lens

120‧‧‧Injection side polarizer

130‧‧‧Injection side polarizer

140‧‧‧ collimating optical system

141‧‧‧1st lens

142‧‧‧2nd lens

149‧‧‧Light diffusion layer

149a‧‧‧Development Department

149b‧‧‧Detection Department

200‧‧‧Color separation light guiding optical system

230, 240, 250‧‧‧ mirrors

260‧‧‧Relay lens

348‧‧‧Rotating plate

351a‧‧‧Diffuse pattern

Ax1, ax2, ax3, ax4‧‧‧ optical axis

B, B p , B s ‧ ‧ blue light

BL‧‧‧Excited light

CONT‧‧‧ control device

G, G p , G s ‧ ‧ green light

K‧‧‧ line

R, R p , R s ‧‧‧Red light

SCR‧‧‧ screen

Y‧‧‧Flood Light

Fig. 1 is a plan view showing a schematic configuration of a projector according to a first embodiment.

Fig. 2 is a view showing a schematic configuration of a first lighting device.

Fig. 3 is a plan view showing a schematic configuration of a second lighting device.

Fig. 4(a) is a view showing a cross-sectional structure of the rotary plate, and Fig. 4(b) is a plan view showing a rotary plate 48.

Fig. 5 is a view showing the configuration of a main part of the detector.

6(a), (b) and (c) conceptually show waveforms of signals detected by the detector.

Fig. 7 is a plan view showing a schematic configuration of a light diffusing element of a second embodiment.

8(a) and 8(b) are views showing the configuration of a main part of a detector included in a light diffusing element.

9(a) and 9(b) are views showing a schematic configuration of a light diffusing element in the third embodiment.

Fig. 10 is a view showing a schematic configuration of a projector according to a fourth embodiment.

Fig. 11(a) is a plan view of a fluorescent light emitting device, and Fig. 11(b) is a cross-sectional view showing a fluorescent light emitting device.

Fig. 12 (a) and (b) are views showing the configuration of the main part of the detector.

Hereinafter, an embodiment of an illumination device and a projector according to the present invention will be described with reference to the drawings.

In addition, in the drawings used in the following description, in order to make the features easy to understand, there is a case where the features are enlarged for convenience, and the dimensional ratios and the like of the respective constituent elements are not necessarily the same as the actual ones.

(Projector)

First, an example of a projector of this embodiment will be described using a drawing. FIG. 1 is a plan view showing a schematic configuration of the projector 1.

The projector 1 is a projection type image display device that displays a color image (image) on a screen (projected surface) SCR. Further, the projector 1 uses three reflection type liquid crystal light valves (liquid crystal panels) corresponding to the respective colors of the red light R, the green light G, and the blue light B as the light modulation device. Further, the projector 1 uses a semiconductor laser (laser light source) that can obtain high-intensity, high-output light as a light source of the illumination device.

Specifically, as shown in FIG. 1 , the projector 1 includes a first illumination device 2 that emits fluorescent light Y (yellow light), and a color separation optical system 3 that emits fluorescence from the first illumination device 2 . The light Y is separated into a red light R and a green light G; the second illumination device 4 emits blue light B; three light modulation devices 5R, 5G, 5B, etc., which are based on image information for each color light R, G, B is modulated to form image light corresponding to the respective color lights R, G, B; a synthetic optical system 6 that synthesizes image light from each of the light modulation devices 5R, 5G, 5B; and a projection optical system 7, It projects the image light from the synthetic optical system 6 towards the screen SCR.

In the first illumination device 2, the blue light (excitation light) emitted from the semiconductor laser is irradiated to the phosphor to excite the phosphor, thereby emitting the fluorescent light (yellow light) from the phosphor. The fluorescent light emitted from the phosphor is emitted toward the color separation optical system 3 after being adjusted to have a uniform luminance distribution (illuminance distribution).

The color separation optical system 3 includes a dichroic mirror 8, a first polarization separation mirror 9a, a second polarization separation mirror 9b, and field lenses 10R and 10G. Among them, the dichroic mirror 8 has a function of separating the fluorescent light Y from the first illumination device 2 into the red light R and the green light G, and transmits the separated red light R and reflects the green light G.

The first polarization separating mirror 9a transmits the red light R p that has passed through the specific polarization direction (for example, P-polarized light) of the dichroic mirror 8 and enters the red light modulation device 5R. The first polarization splitting mirror 9a reflects the S-polarized red light R s modulated by the red light modulation device 5R and causes it to enter the combining optical system 6 as follows.

The second polarization splitting mirror 9b transmits the green light G p of the specific polarization direction (for example, P-polarized light) reflected by the dichroic mirror 8 and causes it to enter the green light modulation device 5G. The second polarization splitting mirror 9b reflects the S-polarized green light G s modulated by the green light modulation device 5G and causes it to enter the combining optical system 6 as follows.

In the second illumination device 4, the blue light B emitted from the semiconductor laser is adjusted to have a uniform luminance distribution (illuminance distribution), and is then emitted toward the blue light modulation device 5B. In the present embodiment, the second illumination device 4 includes the illumination device of the present invention. Further, a third polarization separation mirror 9c is disposed in the optical path of the blue light B emitted from the second illumination device 4.

The third polarization splitting mirror 9c transmits the blue light B p of the specific polarization direction (for example, P-polarized light) emitted from the second illumination device 4 to the blue light modulation device 5B. The third polarization splitting mirror 9c reflects the S-polarized blue light B s modulated by the blue light modulation device 5B and causes it to enter the combining optical system 6 as follows.

The field lens 10R disposed between the dichroic mirror 8 and the first polarization separating mirror 9a causes the red light R to be parallelized. Further, the field lens 10G disposed between the dichroic mirror 8 and the second polarization separating mirror 9b causes the green light G to be parallelized. Further, the field lens 10B disposed between the second illumination device 4 and the third polarization separation mirror 9c causes the blue light B to be parallelized.

The light modulation device 5R, 5G, and 5B includes a reflective liquid crystal light valve (liquid crystal panel), and during the reflection of the respective color lights R, G, and B, the color light R, G, and B are modulated according to the image information. Image light. Further, each of the light modulation devices 5R, 5G, and 5B changes the polarization state of the image light (for example, from P-polarized to S-polarized light) with modulation.

The synthesizing optical system 6 includes a combining aperture, and synthesizes image light corresponding to the respective color lights R, G, and B incident from the respective optical modulation devices 5R, 5G, and 5B, and directs the combined image light toward the projection optical system. 7 shots.

The projection optical system 7 includes a projection lens group that magnifies and projects image light synthesized by the synthesis optical system 6 toward the screen SCR. Thereby, the enlarged color image (image) is displayed on the screen SCR.

Here, the configuration of the first illumination device 2 will be described. FIG. 2 is a view showing a schematic configuration of the first illumination device 2.

As shown in FIG. 2, the first illumination device 2 roughly includes an array light source 21, a collimating optical system 22, a dichroic mirror 23, a collecting optical system 24, a fluorescent light emitting element 25, an integrating optical system 26, and a polarization conversion element 27. And overlapping optical system 28.

Further, in the first illumination device 2, the array light source 21, the collimating optical system 22, and the dichroic mirror are arranged side by side on one of the optical axes ax1 and ax2 orthogonal to each other in the same plane. twenty three. Further, on the other optical axis ax2, the fluorescent light-emitting element 25, the collecting optical system 24, the dichroic mirror 23, the integrator optical system 26, the polarization conversion element 27, and the superimposing optical system 28 are arranged side by side.

The array light source 21 includes an array of a plurality of semiconductor lasers 21a. Specifically, a plurality of semiconductor lasers 21a are arranged in an array in a plane orthogonal to the optical axis ax1. Further, the array light source 21 may use a solid-state light-emitting element such as a plurality of light-emitting diodes (LEDs) instead of the plurality of semiconductor lasers 21a.

The semiconductor laser 21a emits, for example, blue laser light (hereinafter referred to as excitation light) BL having a peak wavelength in a wavelength region of 440 to 480 nm. Also, it is emitted from each semiconductor laser 21a The excitation light BL is a linearly polarized light that is coherently modulated, and is emitted toward the dichroic mirror 23 in parallel with the optical axis ax1.

The excitation light BL emitted from the array light source 21 is incident on the collimating optical system 22.

The collimating optical system 22 converts the excitation light BL emitted from the array light source 21 into parallel light, and includes, for example, a plurality of collimating lenses 22a arranged in an array in correspondence with the respective semiconductor lasers 21a. Then, the excitation light BL converted into parallel light by the collimating optical system 22 is incident on the dichroic mirror 23.

The dichroic mirror 23 reflects the excitation light BL and transmits the fluorescent light Y. This dichroic mirror is disposed in a state of being inclined toward the side of the fluorescent light emitting element 25 at an angle of 45° with respect to the optical axis ax1. Further, the dichroic mirror 23 is not limited to the dichroic mirror, and a two-color cymbal may be used.

The collecting optical system 24 is configured to condense the excitation light BL toward the fluorescent light emitting element 25, and includes at least one or more collecting lenses 24a. Then, the excitation light BL collected by the collecting optical system 24 is incident on the fluorescent light-emitting element 25.

The fluorescent light-emitting device 25 is a so-called reflective rotary fluorescent plate, and includes a phosphor layer 29 that emits fluorescent light Y, a reflective film 30 that reflects the fluorescent light Y, and a rotating plate that supports the phosphor layer 29. The material 31 and the drive motor 32 that rotationally drives the rotary plate 31. As the rotating plate 31, for example, a circular plate is used. Furthermore, the shape of the rotating plate 31 is not limited to the circular plate, and may be a flat plate. The drive motor 32 is electrically connected to a control unit (not shown). Thereby, the control unit controls the rotation of the rotary plate 31 by controlling the drive motor 32. Furthermore, the control unit may also include the following control device CONT.

The rotating plate 31 is rotated at a specific number of revolutions when the projector 1 is used. Here, the specific number of revolutions is a number of revolutions in which heat accumulated in the fluorescent light-emitting element 25 can be dissipated by irradiating the excitation light. The specific number of revolutions is set based on information such as the intensity of the excitation light emitted from the array light source 21, the diameter of the rotating plate 31, and the thermal conductivity of the rotating plate 31. The specific number of revolutions is set in consideration of the safety rate and the like. The specific number of revolutions is set to a value large enough so as not to accumulate heat energy which deteriorates the phosphor layer 29 or melts the rotating plate 31.

In the present embodiment, the specific number of revolutions is set to, for example, 7,500 rpm. In this case, the rotating plate 31 has a diameter of 50 mm, and the optical axis of the blue light incident on the phosphor layer 29 is located at a position 22.5 mm from the center of rotation of the rotating plate 31. That is, in the rotating plate 31, the irradiation point of the blue light moves around the rotation axis at a speed of about 18 m/s to draw a circle.

A reflective film 30 and a phosphor layer 29 are laminated on the surface of the rotating plate 31 on which the excitation light BL is incident. The reflective film 30 is disposed between the rotating plate 31 and the phosphor layer 29. Further, the reflection film 30 and the phosphor layer 29 are provided in a ring shape in the circumferential direction of the rotary plate 31. Further, the excitation light BL is incident on the phosphor layer 29 from the side opposite to the reflection film 30.

The phosphor layer 29 includes a phosphor that is excited by the excitation light BL. The phosphor excited by the excitation light BL emits, for example, the fluorescent light Y having a peak wavelength in a wavelength region of 500 to 700 nm as the first illumination light.

The reflective film 30 includes, for example, a dielectric multilayer film or the like, and reflects the fluorescent light Y emitted from the phosphor layer 29 toward the side where the excitation light BL is incident.

The rotating plate 31 includes a metal disk having a high thermal conductivity such as copper, and the center portion thereof is attached to the rotating shaft 32a of the drive motor 32.

The drive motor 32 rotates the rotating plate 31 in the circumferential direction, and changes the irradiation position of the excitation light BL condensed by the collecting optical system 24 with respect to the phosphor layer 29. Thereby, the heat radiation effect of the heat generated in the phosphor layer 29 by the irradiation of the excitation light BL can be improved.

Further, the fluorescent light Y emitted from the fluorescent light-emitting element 25 passes through the collecting optical system 24, and then enters the dichroic mirror 23. Further, the fluorescent light Y transmitted through the dichroic mirror 23 is incident on the integrator optical system 26.

The integrator optical system 26 uniformizes the luminance distribution (illuminance distribution) of the fluorescent light Y, and includes, for example, a lens array 26a and a lens array 26b. The lens array 26a and the lens array 26b include a plurality of lenses arranged in an array. Integral optical system 26 is not limited to the lens array 26a and the lens array 26b, and a rod integrator or the like may be used, for example. Then, the fluorescent light Y whose luminance distribution is uniformized by the integrator optical system 26 is incident on the polarization conversion element 27.

The polarization conversion element 27 is a combination of a polarization separation film and a phase difference plate, for example, in which the polarization directions of the fluorescent light Y are aligned. Then, the light Y of the fluorescent light having the polarization direction of, for example, the P-polarized component, is incident on the superimposing optical system 28 by the polarization conversion element 27 .

The superimposing optical system 28 includes at least one or more superimposed lenses 28a in which the plurality of light beams emitted from the integrator optical system 26 overlap each other on the illumination region of the optical modulation device or the like. The fluorescent light Y is superposed by the overlapping optical system 28, whereby the luminance distribution (illuminance distribution) is made uniform, and the axis symmetry about the ray axis thereof is improved. Then, the fluorescent light Y superimposed by the overlapping optical system 28 is incident on the color separation optical system 3 (dichroic mirror 8) shown in FIG.

In the first illumination device 2 having the above-described configuration, the fluorescent light (yellow light) Y adjusted to have a uniform luminance distribution (illuminance distribution) can be used as the first illumination light as shown in FIG. The dichroic mirror 8 is emitted.

In addition, the first illuminating device 2 is not necessarily limited to the configuration shown in FIG. 2. For example, the first illuminating device 2 may be configured such that the excitation light BL is disposed in the optical path between the collimating optical system 22 and the dichroic mirror 23. The afocal optical system of the spot diameter or the homogenizer optical system that converts the intensity distribution of the excitation light BL into a uniform state (so-called top hat type distribution).

Further, in the first illumination device 2, the dichroic mirror 23 that reflects the excitation light BL and transmits the fluorescent light Y is used, but a color separation that transmits the excitation light BL and reflects the fluorescent light Y may be used. mirror. In this case, the array light source 21, the collimating optical system 22, the dichroic mirror 23, the collecting optical system 24, and the fluorescent light emitting element 25 are arranged side by side on an optical axis ax1. On the other optical axis ax2, a dichroic mirror 23, an integrator optical system 26, a polarization conversion element 27, and a superposition optical system 28 are arranged side by side.

Next, a specific configuration of the second illumination device 4 as an example of the illumination device to which the present invention is applied will be described with reference to the drawings. FIG. 3 is a plan view showing a schematic configuration of the second illumination device 4.

As shown in FIG. 3, the second illumination device 4 includes an array light source (first light source) 41, a collimating optical system 42, a collecting optical system 43A, a light diffusing element 44, and a mirror member 35 as light source devices in the present invention. The integrating optical system 45, the polarization conversion element 46, and the superposition optical system (concentrating optical system) 47.

In the second illumination device 4, the array light source 41, the collimating optical system 42, and the collecting optical system 43A are arranged side by side on one of the optical axes ax3 and ax4 which are orthogonal to each other in the same plane. The light diffusing element 44 and the mirror member 35. Further, on the other optical axis ax4, the mirror member 35, the integrator optical system 45, the polarization conversion element 46, and the superposition optical system 47 are arranged side by side.

The array light source 41 includes a plurality of semiconductor lasers 41a arranged. Further, the array light source 41 may use a plurality of solid-state light-emitting elements such as light-emitting diodes (LEDs) instead of the plurality of semiconductor lasers 41a.

In the present embodiment, a plurality of semiconductor lasers 41a are arranged in an array in a plane orthogonal to the optical axis ax3. The array light source 41 is electrically connected to the control device CONT to control its driving.

The control device CONT is realized by including a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory) (all of which are omitted). The CPU reads the control program stored in the ROM and expands the RAM to execute the program on the RAM. The control unit CONT controls the operation of the array light source 41 by executing the program using the CPU.

Furthermore, the control device CONT can also control the entirety of the projector 1.

The semiconductor laser 41a emits, for example, a peak wavelength in a wavelength region of 440 to 480 nm. The blue laser light (hereinafter referred to as blue light) B is used as the second illumination light. Further, the blue light B emitted from each of the semiconductor lasers 41a is linearly polarized light that is coherently modulated, and is emitted toward the light diffusing element 44 in parallel with the optical axis ax3. Then, the blue light B emitted from the array light source 41 is incident on the collimating optical system 42.

The collimating optical system 42 converts the blue light B emitted from the array light source 41 into parallel light, and includes, for example, a plurality of collimating lenses 42a arranged in an array in correspondence with the respective semiconductor lasers 41a. Then, the blue light B converted into the parallel light by the collimating optical system 42 is incident on the collecting optical system 43A.

The collecting optical system 43A includes a condenser lens 43c that allows the blue light B to condense toward the light diffusing element 44, and includes at least one or more collecting lenses 43c. Then, the blue light B condensed by the collecting optical system 43A is incident on the light diffusing element 44.

The light diffusing element 44 is a so-called transmissive rotating diffuser, and includes a rotating plate (rotating diffusing plate) 48 that transmits blue light B condensed by the collecting optical system 43A; a light diffusing layer (diffusion portion) 49, which is disposed on the light exit surface side of the rotary plate 48, a detection pattern (detection portion) 51 disposed on the light incident surface side of the rotary plate 48, a drive motor 50 that rotationally drives the rotary plate 48, and a detector 52, It detects light from the detection pattern 51. The detector 52 is electrically connected to the control device CONT, and transmits the detection result (the intensity of the light from the detection pattern 51) to the control device CONT. The control unit CONT controls the driving of the array light source 41 based on the detection result (output signal) transmitted from the detector 52.

The rotating plate 48 includes a translucent circular plate such as glass or optical resin, and its center portion is attached to the rotating shaft 50a of the drive motor 50.

4 is a view showing a configuration of a main portion of the rotary plate 48. FIG. 4(a) is a view showing a cross-sectional configuration of the rotary plate 48, and FIG. 4(b) is a plan view showing a rotary plate 48 viewed from a light incident surface side. Picture.

As shown in FIGS. 4(a) and 4(b), a detection pattern 51 is provided along the circumferential direction on the light incident surface (first surface) of the rotary plate 48. The detection pattern 51 includes a plurality of light shielding patterns 51a. also, On the light exit surface (second surface) of the rotary plate 48, an annular light diffusion layer 49 is provided along the circumferential direction. In the present specification, the surface on which the light from the light source device is incident on the first surface and the second surface of the rotating plate is referred to as a light incident surface, and the other surface is referred to as a light exit surface.

In the present embodiment, the detection pattern 51 is disposed on the outer side in the radial direction of the rotary plate 48 with respect to the light diffusion layer 49. In other words, the detection pattern 51 is provided at a position shifted from the position where the light from the array light source 41 is incident on the light diffusion layer 49 (the formation region of the light diffusion layer 49) in a plan view.

Further, in the present embodiment, the detection pattern 51 and the light diffusion layer 49 are provided along the circumference of the concentric shape with respect to the center of rotation (center) of the circular rotating plate 48. Therefore, the distance between the rotation center of the rotary plate 48 and the detection pattern 51 (the circle passing through the center of the diameter direction of each of the light shielding patterns 51a) and the rotation center and the light diffusion layer 49 (the circle passing through the center of the diameter direction of the light diffusion layer 49) The distance is different. Furthermore, the shape of the rotating plate 48 is not limited to the circular plate, and may be a flat plate.

Further, in order to improve the diffusibility of light, the light diffusion layer 49 may be formed on both surfaces of the rotating plate 48. Further, in order to avoid reflection of excess light, the rotating plate 48 may be formed with an anti-reflection film corresponding to the wavelength of the blue light B. In the present embodiment, the anti-reflection film may be formed on the surface of the rotating plate 48 on the side where the detection pattern 51 is formed, for example.

The detection pattern 51 includes, for example, a plurality of light-shielding patterns 51a intermittently provided by printing light-shielding ink such as carbon black into an island shape. In addition, the optical density (OD (Optical Density) value) of the light-shielding pattern 51a may be 2 or more, and more preferably 3 or more. The detection pattern 51 is formed by printing a material having the best light-shielding property in a step different from the step of forming the light diffusion layer 49, so that it has sufficient light-shielding property.

On the other hand, the light-diffusing layer 49 is formed, for example, by screen printing an ink obtained by kneading a glass powder (glass frit) with a resin by a printing machine, and baking it to make a resin. hardening. The degree of light diffusion depends, for example, on the glass powder. Particle size, shape (spherical or irregular), refractive index of glass, density, refractive index of resin, film thickness of resin. The condition is that the resin does not deteriorate due to the wavelength used. Since heat is generated due to the transmission loss of the diffusion layer, it is preferable to use a resin having a high heat resistance temperature. Therefore, in the present embodiment, for example, a ruthenium resin is used. Further, as a method of disposing the above resin, injection molding by a mold may be used instead of printing.

Further, similarly to the resin, the circular plate constituting the rotating plate 48 is preferably one which does not deteriorate with respect to light and has a high heat-resistant temperature (for example, a so-called whiteboard glass).

Further, the light diffusion layer 49 is not limited to the above-described production method, and may be formed by subjecting the surface of the glass to freeze processing. Further, it can also be formed by transferring (embossing) a fine pattern. Alternatively, it may be formed by welding glass powder, for example, by melting a glass having a melting point lower than that of the rotating plate 48.

As the drive motor 50, for example, a brushless DC (Direct Current) motor is used. The drive motor 50 changes the irradiation position of the blue light B with respect to the light diffusion layer 49 by rotating the rotary plate 48 in the circumferential direction. Thereby, the light diffusion effect of the blue light B can be improved, and the heat dissipation effect of the light diffusion element 44 can also be improved. Then, the blue light B diffused by the light diffusing element 44 is incident on the mirror member 35. Furthermore, the drive motor 50 is electrically connected to the control unit CONT and controls its driving. The control unit CONT detects the rotation state (for example, the rotation direction, the rotation speed, and the like) of the drive motor 50. Further, as a method of detecting the rotational state of the drive motor 50, for example, a method of using a Hall element or a method of detecting a current and a voltage flowing to a drive coil can be exemplified.

In the present embodiment, the control unit CONT is associated with drive control of the drive motor 50 and the array light source 41. For example, the control unit CONT suspends the driving of the array light source 41 when it detects that the rotation of the rotating plate 48 has stopped. Thereby, it is possible to prevent the occurrence of defects such as the burning of the rotating plate 48 due to the rotation of the rotating plate 48 without being rotated.

The mirror member 35 reflects the blue light B diffused by the light diffusing element 44 toward the integrator optical system 45. The blue light B reflected by the mirror member 35 is incident on the integrator optical system System 45.

The integrator optical system 45 is configured to uniformize the luminance distribution (illuminance distribution) of the blue light B, and includes, for example, a lens array 45a and a lens array 45b. The lens array 45a and the lens array 45b include a plurality of lenses arranged in an array. Further, the integrator optical system 45 is not limited to the lens array 45a and the lens array 45b, and for example, a rod integrator or the like may be used. Then, the blue light B whose luminance distribution is uniformized by the integrator optical system 45 is incident on the polarization conversion element 46.

The polarization conversion element 46 is a combination of a polarization separation film and a phase difference plate, for example, in which the polarization directions of the blue light B are aligned. Then, the blue light B p whose polarization direction is uniform, for example, P-polarized, is incident on the superposition optical system 47 by the polarization conversion element 46.

The superimposing optical system 47 is such that the plurality of light beams emitted from the integrator optical system 45 overlap each other on the illumination region of the optical modulation device or the like, and include at least one or more superimposed lenses 47a. The blue light B is superposed by the overlapping optical system 47, whereby the luminance distribution (illuminance distribution) is made uniform, and the axis symmetry about the ray axis thereof is improved. Then, the blue light B superimposed by the superposition optical system 47 is incident on the third polarization separation mirror 9c shown in FIG.

In the second illumination device 4 having the above-described configuration, the blue light B adjusted to have a uniform luminance distribution (illuminance distribution) can be used as the second illumination light toward the third polarization separation mirror 9c shown in FIG. Shoot out.

In addition, the second illuminating device 4 is not necessarily limited to the configuration shown in FIG. 3. For example, the second illuminating device 4 may be configured to adjust the blue light in the optical path between the collimating optical system 42 and the collecting optical system 43A. An afocal optical system of a point diameter of B or a homogenizer optical system that converts the intensity distribution of the blue light B into a uniform state (so-called top hat-shaped distribution).

Further, when a certain abnormality occurs in the rotating plate 48 as described above, the laser light is incident on the integrator optical system 45 in an un-diffused state, that is, in a state of being less diffused. The integrating optical system 45 includes a lens array 45a in which a plurality of lenses are arranged in an array, The construction of 45b. Therefore, when the laser light is not diffused, the light beam is incident only on one of the lens arrays 45a and 45b, so that the uniformity of illumination between the respective light modulation devices 5R, 5G, and 5B is lost, and the display quality is degraded. .

In the projector 1, even if the user views the projection optical system 7, for example, as long as it is a normal operation, a light source corresponding to the number of cells of the lens array can be seen. That is, by increasing the number of scattered light sources, strong laser light is prevented from entering the eyes of the user. On the other hand, when the diffusion plate does not function effectively as described above, the beam of the laser light is incident only on one of the lens arrays 45a, 45b, so that the number of the dispersed light sources is reduced, and the user may directly recognize the light. Strong laser light.

On the other hand, in the second illumination device 4 of the present embodiment, based on the detection result (output signal) transmitted from the detector 52, the control device CONT controls the driving of the array light source 41. In the present embodiment, when some abnormality occurs in the rotary plate 48, the control unit CONT stops the driving of the array light source 41.

Fig. 5 is a view showing the configuration of the main part of the detector 52.

The detector 52 includes a so-called photointerrupter, and as shown in FIG. 5, includes a frame portion 52a, a light-emitting element (second light source) 52b, and a light-receiving element 52c.

In the frame portion 52a, the light-emitting element 52b is disposed on the light-emitting surface side of the rotating plate 48 (the surface on which the light-diffusing layer 49 is formed), and the light-receiving element 52c is disposed on the light-incident surface side of the rotating plate 48 (the detection pattern is formed). The light-emitting element 52b and the light-receiving element 52c are held in a state of being opposed to each other. Further, the light-emitting element 52b and the light-receiving element 52c are disposed so as to sandwich the detection pattern 51.

In the present embodiment, the light-emitting element 52b includes, for example, a light-emitting diode (LED). Further, the light receiving element 52c includes, for example, a photodiode or a photoelectric crystal.

The light-emitting element 52b emits light of a wavelength band different from the blue light B emitted from the semiconductor laser 41a (for example, 700 nm to 1000 nm in the near-infrared). By using such a near-infrared light, a higher luminous efficiency can be obtained. Moreover, by having the emission different from the array light source 41 The light-emitting element 52b of the light of the band can separate the functions of the respective light sources. Thereby, the laser light from the array light source 41 can be favorably emitted to the outside.

In the present embodiment, as the light-receiving element 52c, a photodiode having a high light-sensing sensitivity to the near-infrared is used. Further, in the present embodiment, since the blue light B emitted from the semiconductor laser 41a is visible light, the filter 53 that cuts off the visible light and transmits the near infrared ray is disposed on the surface of the light receiving element 52c. Thereby, even when the light leakage of the blue light B emitted from the semiconductor laser 41a is incident on the light receiving element 52c, it can be cut off. Thereby, erroneous detection due to the light receiving element 52c can be prevented.

Further, instead of or in combination with the filter 53, the light shielding member, the aperture stop, and the like may be provided on the optical path between the light-emitting element 52b and the light-receiving element 52c, thereby preventing detection light (near-infrared). Light other than light affects the light receiving element 52c.

Next, a method of detecting the light from the detection pattern 51 by the detector 52 will be described with reference to FIG. Fig. 6 is a view conceptually showing the waveform of a signal detected by the detector 52, Fig. 6(a) is a diagram showing a signal of a normal state, and Fig. 6(b) is a diagram showing a signal of a case where a part of the pattern is missing. Fig. 6(c) is a view showing a signal of a state in which the rotary plate 48 is detached.

The rotating plate 48 is rotated in accordance with the rotational driving of the drive motor 50. At this time, the light receiving element 52c of the detector 52 detects a periodic signal. The signal detected by the light receiving element 52c becomes a Low level when the light is shielded, and becomes a High level when light is incident on the light receiving element 52c. In this case, when the rotating plate 48 normally rotates, as shown in FIG. 6(a), the light receiving element 52c periodically detects a signal in which the High level and the Low level are continuous.

On the other hand, when the detector 52 generates some abnormality in the rotating plate 48 (for example, in the case where the rotating plate 48 is broken or notched or the rotating plate 48 is detached from the rotating shaft 50a), it is detected. At least a portion of the pattern of the signal lacks the level of the Low level

When a crack or a notch is generated in the rotating plate 48, a defective portion is also generated in a portion of the light shielding pattern 51a. When the defective portion of the light-shielding pattern 51a passes between the light-emitting element 52b and the light-receiving element 52c, the detection time at which the high level is generated by the detection light passing through the defective portion is longer than the normal period. Therefore, as shown in FIG. 6(b), the light receiving element 52c detects, at least in part, a signal of an irregular period in which the High level is continuous.

On the other hand, when the rotating plate 48 is detached from the rotating shaft 50a, the light blocking pattern 51a does not pass between the light emitting element 52b and the light receiving element 52c. Therefore, the detection light is always incident on the light receiving element 52c. Therefore, as shown in FIG. 6(c), the light receiving element 52c continuously detects only the signal of the High level.

In the present embodiment, the detector 52 detects a specific signal from the light received from the detection pattern 51, and transmits the detected signal to the control device CONT. The control unit CONT discriminates the state of the rotary plate 48 based on the signals shown in Figs. 6(a) to (c) transmitted from the detector 52.

The control device CONT determines that the rotating plate 48 has not generated an abnormality, for example, when the signal shown in Fig. 6(a) is received. In this case, the control unit CONT continues to drive the array light source 41.

On the other hand, when the control device CONT receives the signal shown in Fig. 6 (b) or Fig. 6 (c), for example, it is judged that an abnormality has occurred in the rotary plate 48. In this case, the control unit CONT stops the driving of the array light source 41. Further, in the present embodiment, the control unit CONT also detects the rotation state of the drive motor 50. Therefore, the control unit CONT stops the rotation of the drive motor 50 at the time when the driving of the array light source 41 is stopped.

Further, as the signal detected by the detector 52, the signal periodically repeated with the High level and the Low level is used, and therefore, when the light-emitting element 52b or the light-receiving element 52c in the detector 52 fails, it is no longer generated. Periodic detection signal. The control unit CONT also stops the driving of the array light source 41 in the event of a failure of the detector 52. Thereby, the driving of the array light source 41 is also stopped by the failure of the detector 52, thereby preventing the undetectable The case where the laser light is continuously irradiated in the abnormal state of the rotating plate 48 is measured.

As described above, according to the present embodiment, since the detection pattern 51 is disposed at a position different from the position where the light from the array light source 41 is incident on the light diffusion layer 49, there is no light emitted from the light diffusion layer 49 and the light passing through the detection pattern 51. Detecting the mixing of light. Thereby, it is prevented that the light diffused by the light diffusion layer 49 is hindered by the detection pattern 51. Further, since the detection pattern 51 is printed on the rotary plate 48 and the like, the cost can be reduced. Therefore, the second illuminating device 4 is an illuminating device, that is, regardless of which of the transmission type and the reflection type the rotating plate 48 is, it is not restricted by the detection method, and the light from the detection pattern 51 can be favorably detected. On the other hand, the versatility (exception or detachment) caused by the rotating plate 48 is detected, and the versatility is excellent. Further, in the projector 1, the second illuminating device 4 is provided, and the reliability of the rotating plate 48 can be satisfactorily detected at a low cost.

Further, when the rotating plate 48 stops rotating, the laser light is incident on one point of the rotating plate 48, and the light diffusing layer 49 or the glass substrate is broken. According to the present embodiment, it is possible to prevent the rotating plate 48 from being broken or falling due to the suspension of the irradiation of the laser light, thereby causing the undiffusing laser light to be emitted to the outside of the body.

(Second embodiment)

Next, the light diffusing element of the second embodiment will be described. In the above embodiment, the case where the detection pattern 51 includes the light-shielding light-shielding pattern 51a is exemplified, but a different aspect of the embodiment is that, for example, a part of the light diffusion layer is used as the detection pattern. Furthermore, the configuration other than this is the same as the above-described first embodiment. Therefore, the same components as those in the above-described embodiments are denoted by the same reference numerals, and their detailed description is omitted.

Fig. 7 is a plan view showing a schematic configuration of a light diffusing element 144 in which one portion of the light diffusing layer is used as a detecting pattern in the embodiment. Fig. 8 is a view showing a configuration of a main part of a detector 152 provided in the light diffusing element 144 in the present embodiment. As shown in Figures 7 and 8, The light diffusing element 144 includes a rotating plate 48, a light diffusing layer 149 disposed on the light emitting surface side of the rotating plate 48, a driving motor 50 (not shown), and a detector 152.

As shown in FIG. 7, the light-diffusion layer 149 is provided on the light-emitting surface side (first surface) of the rotating plate 48, and includes a diffusing portion 149a that functions as a light diffusing portion and a detecting portion 149b that functions as a detecting pattern. .

The diffusing portion 149a is annularly provided on the rotating plate 48. The detecting portion 149b is disposed on the outer side in the diameter direction of the rotating plate 48 with respect to the diffusing portion 149a, and is provided integrally with the diffusing portion 149a. The detecting portion 149b is intermittently provided along the rotation direction of the rotary plate 48.

In other words, the detecting unit 149b is provided at a position different from the position where the light from the array light source 41 enters the diffusing portion 149a (the region where the diffusing portion 149a is formed). The detecting portion 149b and the diffusing portion 149a are provided along the circumference of the concentric shape with respect to the center of rotation (center) of the circular rotating plate 48. Therefore, the distance between the center of rotation of the rotating plate 48 and the detecting portion 149b (the circle passing through the center of the detecting portion 149b) and the distance between the center of rotation and the diffusing portion 149a (the circle passing through the center of the diffusing portion 149a) are different.

The detector 152 is electrically connected to the control device CONT (refer to FIG. 3), and transmits the detection result (the intensity of the light from the detection pattern 51) to the control device CONT. The control unit CONT controls the driving of the array light source 41 based on the detection result (output signal) transmitted from the detector 152.

The detector 152 includes a so-called photointerrupter, and as shown in FIGS. 8(a) and 8(b), includes a light-emitting element (second light source) 152b that emits near-infrared rays, and a light-receiving element 152c. Further, the light-emitting element 152b and the light-receiving element 152c are held by a frame member (not shown). A filter 53 that cuts off visible light and transmits near-infrared rays is provided on the light receiving surface of the light receiving element 152c.

The light-emitting element 152b is disposed on the light-emitting surface side of the rotating plate 48 (on the side on which the light-diffusing layer 149 is formed). The light receiving element 152c is disposed on the light incident surface side of the rotating plate 48 and is apart from the line K of the chief ray of light incident on the detecting portion 149b on the outer side in the radial direction of the rotating plate 48. That is, when the rotating plate 48 is viewed in a plan view, the light receiving element 152c is disposed in no A position overlapping the rotating plate 48.

When the detecting portion 149b is positioned between the light-emitting element 152b and the light-receiving element 152c by the rotation of the rotary plate 48, the state shown in Fig. 8(a) is obtained. As shown in FIG. 8(a), the detection light emitted from the light-emitting element 152b is incident on the detecting portion 149b. The detection light incident on the detecting portion 149b is radially diffused by scattering. Therefore, the light receiving element 152c disposed on the outer side of the rotating plate 48 can receive the detection light scattered by the detecting portion 149b.

On the other hand, when the detecting unit 149b is not present between the light-emitting element 152b and the light-receiving element 152c by the rotation of the rotary plate 48, the state shown in Fig. 8(b) is obtained. As shown in FIG. 8(b), the detection light emitted from the light-emitting element 152b passes through the rotating plate 48. At this time, since the detection light is not scattered, it is not incident on the light receiving element 152c disposed on the outer side of the rotating plate 48.

In the present embodiment, the light receiving element 152c also detects a periodic signal in association with the rotational driving of the rotating plate 48. The signal detected by the light receiving element 152c becomes a High level when receiving the diffused detection light, and becomes a Low level when the detection light is not received. In this case, when the rotating plate 48 normally rotates, the light receiving element 152c periodically detects a signal in which the High level and the Low level are continuous (see FIG. 6(a)).

On the other hand, when the rotating plate 48 generates some abnormality, the detector 152 detects at least a partial periodic irregular signal of the Low level (refer to Figs. 6(b) and 6(c)).

In the present embodiment, the detecting portion 149b is also disposed at a position different from the position at which the light from the array light source 41 enters the diffusing portion 149a. Therefore, the light emitted from the diffusing portion 149a does not mix with the detecting light passing through the detecting portion 149b. In the case, the malfunction (defect or fall off) caused by the rotating plate 48 can be satisfactorily detected.

Further, since the diffusion portion 149a and the detection portion 149b can be integrally formed in the same manufacturing step, it is possible to further reduce the manufacturing cost by improving the productivity.

(Third embodiment)

Next, the light diffusing element of the third embodiment will be described. In the first implementation described above In the embodiment, a case where the detection pattern 51 includes a plurality of light-shielding patterns 51a is exemplified, but a different aspect of the embodiment is that the detection pattern includes one annular light-shielding pattern. Furthermore, the configuration other than this is the same as the above-described first embodiment. Therefore, the same components as those in the above-described embodiments are denoted by the same reference numerals, and their detailed description is omitted.

Fig. 9 is a view showing a schematic configuration of a light diffusing element 244 in the present embodiment, and Fig. 9(a) shows a planar configuration obtained by observing the rotating plate 48 from the light incident surface side, and Fig. 9(b) shows the present embodiment. The main part of the detector 252 of the light diffusing element 244 is constructed.

As shown in FIGS. 9(a) and 9(b), the light diffusing element 244 includes a rotating plate 48, a detection pattern 251, a light diffusion layer 49, a drive motor 50 (not shown), and a detector 252. In the present embodiment, the detection pattern 251 is formed in a ring shape along the circumferential direction of the rotary plate 48.

The detector 252 is electrically connected to the control device CONT (refer to FIG. 3), and transmits the detection result (the intensity of the light from the detection pattern 251) to the control device CONT. The control unit CONT controls the driving of the array light source 41 based on the detection result (output signal) transmitted from the detector 252.

The detector 252 includes a so-called photointerrupter, and as shown in FIG. 9(b), includes a light-emitting element (second light source) 252b that emits near-infrared rays, and a light-receiving element 252c. Further, the light-emitting element 252b and the light-receiving element 252c are held by a frame member (not shown). A filter 53 that cuts off visible light and transmits near-infrared rays is provided on the light receiving surface of the light receiving element 252c.

In the present embodiment, when the rotary plate 48 is rotated in a normal state, the detection pattern 251 is always positioned between the light-emitting element 252b and the light-receiving element 252c. Therefore, the detection light emitted from the light-emitting element 252b is in a state of being blocked by the detection pattern 251. Therefore, the light receiving element 252c does not receive the detection light.

On the other hand, when there is a problem in the rotating plate 48 (for example, a case where a gap, a defect, or a fall occurs), the state shown in Fig. 9 (b) is obtained. For example, if the end portion of the rotary plate 48 is broken and is broken, as shown in FIG. 9(b), a gap is formed at the end of the rotary plate 48. 48a. When the defective portion 48a is generated in the rotating plate 48 due to a notch, a slit, or the like, the detection light emitted from the light-emitting element 252b is emitted toward the light-receiving element 252c via the defective portion 48a. Therefore, the light receiving element 252c can receive the detection light emitted through the defect portion 48a.

In the present embodiment, the light-receiving element 252c detects a fixed signal in accordance with the normal rotational drive of the rotary plate 48 (rotation drive in a state in which no malfunction occurs). The signal detected by the light receiving element 252c becomes a High level, for example, when the detection light is received, and becomes a Low level when the detection light is not received. In this case, when the rotary plate 48 normally rotates, the light receiving element 252c always detects the signal of the Low level.

According to the present embodiment, when the rotating plate 48 is in a state of cracking, chipping, or falling off, the light receiving element 252c detects a signal having a high level. Thereby, the malfunction caused by the rotating plate 48 can be satisfactorily detected. Further, in the configuration of the present embodiment, since the signal from the detection pattern 251 is fixed, the rotation of the rotary plate 48 cannot be detected. Therefore, in the present embodiment, the control unit CONT detects the rotation state of the drive motor 50. Therefore, for example, even when the detector 252 malfunctions, it is possible to prevent the occurrence of a problem that the rotating plate 48 is broken due to the continuous incidence of the laser light on the rotating plate 48 by stopping the rotation of the rotating plate 48.

(Fourth embodiment)

Next, the light diffusing element of the fourth embodiment will be described. In the above-described first to third embodiments, an illuminating device using a transmissive rotating diffuser as a rotating diffuser provided with a diffusing portion is exemplified, but a different aspect of the present embodiment is applied to a transmissive type. Lighting device for fluorescent wheels. The same members as those of the above-described embodiments are denoted by the same reference numerals, and their detailed description is omitted.

Fig. 10 is a view showing a schematic configuration of a projector and an illumination device in the embodiment. As shown in FIG. 10, the projector 101 includes an illumination device 104, a color separation light guiding optical system 200, a liquid crystal light modulation device 105R as a light modulation device, a liquid crystal light modulation device 105G, a liquid crystal light modulation device 105B, and a synthesis. Optical system 6, projection optical system 7 and control Manufacturing device CONT.

The illumination device 104 includes an array light source 41, a collimating optical system 42, a collecting optical system 43A, a fluorescent light emitting element 344, a collimating optical system 140, and an illumination optical system 103. A collimating optical system 42, a collecting optical system 43A, a fluorescent light emitting element 344, a collimating optical system 140, and an illumination optical system 103 are sequentially disposed on the optical path of the excitation light emitted from the array light source 41.

The fluorescent light-emitting element 344 is a so-called transmissive rotating fluorescent plate, and includes a phosphor layer (diffusion portion) 55 that emits fluorescent light Y, a rotating plate 348 that supports the phosphor layer 55, and a drive motor 32. It rotationally drives the rotating plate 348.

Fig. 11 is a view showing the configuration of the fluorescent light-emitting device 344. Fig. 11(a) is a plan view of the fluorescent light-emitting device 344, and Fig. 11(b) is a cross-sectional view of the fluorescent light-emitting device 344. Fig. 12 is a view showing a configuration of a main part of a detector 352 provided in the fluorescent light-emitting device 344 of the present embodiment.

As shown in FIGS. 11(a) and 11(b), the fluorescent light-emitting element 344 is provided with a detection pattern 351 along the circumferential direction on the light incident surface (second surface) side of the rotary plate 348. In the present embodiment, the detection pattern 351 includes a plurality of diffusion patterns 351a including light diffusion layers having the same configuration as the light diffusion layer 149 shown in FIG. Further, on the light emitting surface (first surface) of the rotating plate 348, a fluorescent light emitting region is set around the rotation axis of the rotating plate 348, and a phosphor layer 55 is disposed in the fluorescent light emitting region.

That is, the detection pattern 351 is provided at a position different from a position (fluorescent light-emitting region) where light from the array light source 41 is incident on the phosphor layer 55. The detection pattern 351 and the phosphor layer 55 are disposed along the circumference of the concentric shape with respect to the center of rotation (center) of the circular rotating plate 348. Therefore, the distance between the center of rotation of the rotary plate 348 and the detection pattern 351 (the circle passing through the center of the diametrical direction of each of the light-shielding patterns 51a) and the center of rotation and the phosphor layer 55 (the circle passing through the center of the diameter direction of the fluorescent light-emitting region) The distance is different.

The plurality of diffusion patterns 351a are intermittently disposed along the rotation direction of the rotary plate 348.

In the present embodiment, the excitation light (blue light) condensed by the condensing lens 43c is irradiated to the phosphor layer 55 from the surface of the rotating plate 348 opposite to the side on which the phosphor layer 55 is formed. Further, the fluorescent light-emitting element 344 emits the fluorescent light emitted from the phosphor layer 55 toward the collimating optical system 40 on the side opposite to the side on which the excitation light is incident. Further, a component of the excitation light that is not converted into fluorescence by the phosphor particles is emitted from the fluorescent light-emitting device 344 toward the collimating optical system 40 together with the fluorescent light. Therefore, white light is emitted from the fluorescent light emitting element 344 toward the collimating optical system 140.

The collimating optical system 140 is disposed on the optical path of the light (excitation light and fluorescent light) between the fluorescent light emitting element 344 and the illumination optical system 103. The collimating optical system 140 includes a first lens 141 that suppresses diffusion of light from the fluorescent light-emitting element 344, and a second lens 142 that parallelizes light incident from the first lens 141. The first lens 141 is composed of, for example, a convex meniscus lens, and the second lens 142 is formed of, for example, a convex lens. The collimating optical system 140 causes the light from the fluorescent light-emitting element 344 to be incident on the illumination optical system 103 in a substantially parallel state.

The illumination optical system 103 is disposed on the optical path between the illumination device 104 and the color separation light guiding optical system 200. The illumination optical system 103 includes a collecting lens (concentrating optical system) 111, a rod integrator 112, and a parallelizing lens 113.

The condensing lens 111 is composed of, for example, a convex lens. The condensing lens 111 is disposed on the ray axis of the light incident from the collimating optical system 140 to condense the light.

Light that has passed through the condensing lens 111 is incident on one end side of the rod integrator 112. The rod integrator 112 is a columnar optical member extending in the direction of the optical path, and the light transmitted through the condensing lens 111 is mixed by multiple reflection of the light transmitted through the inside, thereby uniformizing the luminance distribution. The cross-sectional shape of the rod integrator 112 orthogonal to the optical path direction is substantially similar to the shape of the liquid crystal light modulation device 105R, the liquid crystal light modulation device 105G, and the liquid crystal light modulation device 105B.

The light emitted from the other end side of the rod integrator 112 is parallelized by the parallelizing lens 113, and is emitted from the illumination optical system 103.

The color separation light guiding optical system 200 includes a dichroic mirror 210, a dichroic mirror 220, a mirror 230, a mirror 240, a mirror 250, and a relay lens 260. The color separation light guiding optical system 200 has a function of separating light from the illumination optical system 103 into red light R, green light G, and blue light B, and light colors of red light R, green light G, and blue light B The liquid crystal light modulation device 105R, the liquid crystal light modulation device 105G, and the liquid crystal light modulation device 105B that are to be illuminated are introduced.

The dichroic mirror 210 and the dichroic mirror 220 are formed with a mirror having a wavelength selective transmission film formed on the substrate, and the wavelength selective transmission film reflects light in a specific wavelength region and transmits light in other wavelength regions. Specifically, the dichroic mirror 210 transmits the blue light component and reflects the red light component and the green light component. The dichroic mirror 220 reflects the green light component and transmits the red light component.

The mirror 230, the mirror 240, and the mirror 250 are mirrors that reflect incident light. Specifically, the mirror 230 reflects the blue light component transmitted through the dichroic mirror 210. The mirror 240 and the mirror 250 reflect the red light component transmitted through the dichroic mirror 220.

The blue light transmitted through the dichroic mirror 210 is reflected by the mirror 230 and is incident on the image forming region of the liquid crystal light modulation device 105B for blue light. The green light reflected by the dichroic mirror 210 is further reflected by the dichroic mirror 220, and is incident on the image forming region of the liquid crystal light modulation device 105G for green light. The red light transmitted through the dichroic mirror 220 passes through the mirror 240 on the incident side, the relay lens 260, and the mirror 250 on the exit side, and enters the image forming region of the liquid crystal light modulation device 105R for red light.

In the present embodiment, the liquid crystal light modulation device 105R, the liquid crystal light modulation device 105G, and the liquid crystal light modulation device 105B are different from the above-described embodiment, and include a transmission type liquid crystal light valve. Each of the liquid crystal light modulation devices 105R, 105G, and 105B includes, for example, a liquid crystal element 110, an incident side polarizing plate 120 that sandwiches the liquid crystal element 110, and an emission side polarizing plate 130. The incident side polarizing plate 120 and the output side polarizing plate 130 have a configuration in which the transmission axes are orthogonal to each other (distribution of a cross nicol).

The image light emitted from the synthetic optical system 6 is enlarged and projected onto the screen SCR by the projection optical system 7, and is recognized as a color image by the eyes of the user.

As described above, in the projector 101 of the present embodiment, the laser light emitted from the array light source 41 and transmitted through the phosphor layer 55 is irradiated onto the screen SCR.

As shown in FIGS. 12(a) and (b), the detector 352 includes a light-emitting element (second light source) 352b that emits near-infrared rays, and a light-receiving element 352c. Further, the light-emitting element 352b and the light-receiving element 352c are held by a frame member (not shown). A filter 53 that cuts off visible light and transmits near-infrared rays is provided on the light receiving surface of the light receiving element 352c.

The light-emitting element 352b is disposed on the light incident surface side of the rotating plate 348 (on the side on which the detection pattern 351 is formed). The light receiving element 352c is disposed on the light emitting surface side of the rotating plate 348 and is apart from the line K of the chief ray of light incident on the detecting portion 149b on the outer side in the radial direction of the rotating plate 348. In other words, when the rotating plate 348 is viewed in plan, the light receiving element 352c is disposed at a position that does not overlap the rotating plate 348.

When the diffusion pattern 351a is positioned between the light-emitting element 352b and the light-receiving element 352c by the rotation of the rotary plate 348, the state shown in Fig. 12(a) is obtained. As shown in FIG. 12(a), the detection light emitted from the light-emitting element 352b is incident on the diffusion pattern 351a. The detection light incident on the diffusion pattern 351a is radially diffused by scattering. Therefore, the light receiving element 352c disposed on the outer side of the rotating plate 348 can receive the detection light scattered by the diffusion pattern 351a.

On the other hand, when the diffusion pattern 351a is not present between the light-emitting element 352b and the light-receiving element 352c by the rotation of the rotary plate 348, the state shown in Fig. 12(b) is obtained. As shown in FIG. 12(b), the detection light emitted from the light-emitting element 352b passes through the rotating plate 348. At this time, since the detection light is not scattered, it is not incident on the light receiving element 152c disposed on the outer side of the rotating plate 348.

In the present embodiment, the light receiving element 352c also detects a periodic signal in association with the rotational driving of the rotating plate 348. Regarding the signal detected by the light receiving element 352c, for example, if the case where the diffused detection light is received is set to the High level, the detection light is not received. When the shape is set to the Low level, the light receiving element 352c periodically detects a signal in which the High level and the Low level are continuous as long as the rotating plate 348 normally rotates (see FIG. 6(a)).

On the other hand, when a certain abnormality occurs in the rotating plate 348, the detector 352 detects, at least in part, a periodic irregular signal of the Low level (refer to Figs. 6(b) and (c)).

In the present embodiment, the detection pattern 351 is also disposed at a position different from the position where the light from the array light source 41 is incident on the phosphor layer 55, so that the fluorescent light Y and the detection pattern emitted from the phosphor layer 55 are not present. In the case where the detection light of 351 is mixed, the malfunction (defect or peeling) caused by the rotating plate 348 can be well detected.

In addition, the present invention is not limited to the above-described embodiments, and various modifications can be added without departing from the spirit and scope of the invention.

For example, in the above-described embodiment, the case where the diffused light or the transmitted light from the detection patterns 51, 251, and 351 and the detecting portion 149b is used as the detection light is exemplified, but the present invention is not limited thereto, and may be used. The reflected light is used as the detection light. In this case, the detecting portion formed on the rotating plate may have a reflection characteristic that reflects at least a part of the detected light. Further, a detection signal having a characteristic of partially reflecting the detection light and transmitting the remaining portion as a detection portion may be used, and the detection signal of the rotating plate may be obtained based on the detection light obtained by combining the diffused light or the transmitted light with the reflected light.

Further, in the above-described first embodiment, the detection pattern 51 is disposed on the outer side in the radial direction of the rotary plate 48 with respect to the light diffusion layer 49. However, the present invention is not limited thereto, and the light diffusion layer 49 may be opposed to the detection pattern. 51 is disposed on the outer side in the diameter direction of the rotary plate 48.

Further, in the second embodiment, the detecting portion 149b is disposed on the outer side in the radial direction of the rotating plate 48 with respect to the diffusing portion 149a. However, the present invention is not limited thereto, and the diffusing portion 149a may be disposed with respect to the detecting portion 149b. On the outer side in the diameter direction of the rotary plate 48.

Further, in the third embodiment, the detection pattern 251 is opposed to the light diffusion layer 49. It is disposed on the outer side in the radial direction of the rotary plate 48. However, the present invention is not limited thereto, and the light diffusion layer 49 may be disposed on the outer side in the radial direction of the rotary plate 48 with respect to the detection pattern 251.

Further, in the fourth embodiment, the detection pattern 351 is disposed on the outer side in the radial direction of the rotating plate 48 with respect to the phosphor layer 55. However, the present invention is not limited thereto, and the phosphor layer 55 may be opposed to the detection pattern. The 351 is disposed on the outer side in the diameter direction of the rotary plate 48.

Further, in the above embodiment, the projector 1 including the three light modulation devices 5R, 5G, and 5B is exemplified, but the projector 1 can also be applied to a color image (image) by one light modulation device. Further, the optical modulation device is not limited to the liquid crystal panel, and for example, a digital micro-mirror device (DMD (registered trademark of Texas Instruments)) or the like can be used.

Further, in the above-described fourth embodiment, an illumination device using a transmissive rotary fluorescent plate is exemplified, but the present invention is not limited thereto, and can be applied to an illumination device using a reflective rotary fluorescent plate. In other words, the rotation state of the rotating plate 31 of the first illuminating device 2 of the first embodiment can be detected, and the driving of the array light source 21 can be controlled based on the detection result.

1‧‧‧Projector

2‧‧‧1st lighting device

3‧‧‧Separation optical system

4‧‧‧2nd lighting device (lighting device)

5B, 5G, 5R‧‧‧Light modulation device

6‧‧‧Synthetic optical system

7‧‧‧Projection optical system

8‧‧‧ dichroic mirror

9a‧‧‧1st polarized separation mirror

9b‧‧‧2nd polarized separation mirror

9c‧‧‧3rd polarizing mirror

10B, 10G, 10R‧‧ field lens

B, B p , B s ‧ ‧ blue light

G, G p , G s ‧ ‧ green light

R, R p , R s ‧‧‧Red light

SCR‧‧‧ screen

Y‧‧‧Flood Light

Claims (12)

  1. A lighting device comprising: a light source device; and a rotary diffusing plate comprising: a first surface, a second surface, a diffusing portion provided on the first surface, and at least one of the first surface and the second surface a detecting portion for receiving light from the light source device; a collecting optical system for allowing light from the diffusing portion to enter; a detector for detecting light from the detecting portion; and a control device according to the above The light source device is controlled by a signal output from the detector; and the detecting portion is provided at a position different from a position at which light from the light source device is incident on the diffusing portion.
  2. The illumination device of claim 1, wherein the detecting portion shields at least a portion of the incident light.
  3. The illumination device of claim 2, wherein the detection unit is provided on the second surface.
  4. The illumination device of claim 1, wherein the detecting portion diffuses at least a portion of the incident light.
  5. The illumination device of claim 4, wherein the detection unit is provided on the first surface.
  6. The illumination device of claim 4 or 5, wherein the detector is disposed at a position away from an extension of the chief ray of light incident on the detection portion.
  7. The illumination device according to any one of claims 1 to 5, wherein the light source device includes a first light source and a second light source, and light from the first light source is incident on the diffusion portion, and light from the second light source is incident on the light source. Detection department.
  8. The illumination device of claim 7, wherein the first light source and the second light source respectively Light from different bands.
  9. The illumination device of claim 1, wherein the detecting portion reflects at least a portion of the incident light.
  10. The illumination device according to any one of claims 1 to 9, wherein the detecting portion includes a plurality of detection patterns intermittently disposed along a rotation direction of the rotary diffusion plate.
  11. The illuminating device of any one of claims 1 to 10, wherein the diffusing portion is a phosphor layer.
  12. A projector comprising: an illumination device that illuminates illumination light; a light modulation device that forms image light by modulating the illumination light according to image information; and a projection optical system that projects the image Light; and as the illumination device described above, the illumination device according to any one of claims 1 to 11 is used.
TW103126476A 2013-08-05 2014-08-01 Illumination device and projector TWI533077B (en)

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CN105378561B (en) 2017-07-18
US20160170199A1 (en) 2016-06-16
TWI533077B (en) 2016-05-11
EP3032329A1 (en) 2016-06-15
EP3032329A4 (en) 2017-03-15
RU2016107752A (en) 2017-09-14
BR112016002886A2 (en) 2017-08-01
WO2015019591A1 (en) 2015-02-12
US9869856B2 (en) 2018-01-16
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KR20160033731A (en) 2016-03-28
JP6268798B2 (en) 2018-01-31

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